Pavement thickness detection device for highway engineering

The utility model discloses a road surface thickness detection device for highway engineering, which comprises a mounting rack, a dedusting and cooling mechanism and an electric expansion piece, the dedusting and cooling mechanism is cooperatively connected to the left side wall of the mounting rack, and the electric expansion piece is detachably connected to the top end of the mounting rack. The dust removing and cooling mechanism is composed of a water storage tank, a water absorber, a water spraying pipe and a water spraying head, the water absorber is connected to the right side wall of the water storage tank in a matched mode, the water spraying pipe communicates with the bottom end of the water absorber, and the water spraying head is detachably connected with the tail end of the water spraying pipe. The drilling mechanism is simple in structure and convenient to use, sampling detection is facilitated during use, cleaning is facilitated after detection, next use is facilitated, dust dispersion can be ef